<?php

namespace App\Models;

use App\Http\Traits\TwoColumnUniqueUndeletedTrait;
use App\Models\Traits\HasUploads;
use App\Models\Traits\Loggable;
use App\Models\Traits\Requestable;
use App\Models\Traits\Searchable;
use App\Presenters\AssetModelPresenter;
use App\Presenters\Presentable;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Query\Builder;
use Illuminate\Support\Facades\Gate;
use Illuminate\Support\Facades\Storage;
use Watson\Validating\ValidatingTrait;

/**
 * Model for Asset Models. Asset Models contain higher level
 * attributes that are common among the same type of asset.
 *
 * @version v1.0
 */
class AssetModel extends SnipeModel
{
    use HasFactory;
    use HasUploads;
    use Loggable, Presentable, Requestable;
    use SoftDeletes;
    use TwoColumnUniqueUndeletedTrait;

    /**
     * Whether the model should inject its identifier to the unique
     * validation rules before attempting validation. If this property
     * is not set in the model it will default to true.
     *
     * @var bool
     */
    protected $injectUniqueIdentifier = true;

    use ValidatingTrait;

    protected $table = 'models';

    protected $presenter = AssetModelPresenter::class;

    // Declare the rules for the model validation

    protected $rules = [
        'name' => 'string|required|min:1|max:255|two_column_unique_undeleted:model_number',
        'model_number' => 'string|max:255|nullable|two_column_unique_undeleted:name',
        'min_amt' => 'integer|min:0|nullable',
        'category_id' => 'required|integer|exists:categories,id',
        'manufacturer_id' => 'integer|exists:manufacturers,id|nullable',
        'eol' => 'integer:min:0|max:240|nullable',
    ];

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'category_id',
        'depreciation_id',
        'eol',
        'fieldset_id',
        'image',
        'manufacturer_id',
        'min_amt',
        'model_number',
        'name',
        'notes',
        'requestable',
        'require_serial',
    ];

    use Searchable;

    /**
     * The attributes that should be included when searching the model.
     *
     * @var array
     */
    protected $searchableAttributes = [
        'created_at',
        'eol',
        'min_amt',
        'model_number',
        'name',
        'notes',
    ];

    /**
     * The relations and their attributes that should be included when searching the model.
     *
     * @var array
     */
    protected $searchableRelations = [
        'depreciation' => ['name'],
        'category' => ['name'],
        'manufacturer' => ['name'],
        'fieldset' => ['name'],
        'adminuser' => ['first_name', 'last_name', 'display_name'],
    ];

    /**
     * Computed aliases (withCount/withSum) that can be searched via TextSearch filters.
     *
     * @var array
     */
    protected $searchableCounts = [
        'assets_count',
        'remaining',
        'assets_assigned_count',
        'assets_archived_count',
    ];

    protected static function booted(): void
    {
        static::forceDeleted(function (AssetModel $assetModel) {
            $assetModel->requests()->forceDelete();
        });

        static::softDeleted(function (AssetModel $assetModel) {
            $assetModel->requests()->delete();
        });
    }

    /**
     * Establishes the model -> assets relationship
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since  [v1.0]
     *
     * @return Relation
     */
    public function assets()
    {
        return $this->hasMany(Asset::class, 'model_id');
    }

    public function availableAssets()
    {
        return $this->hasMany(Asset::class, 'model_id')->RTD();
    }

    public function assignedAssets()
    {
        return $this->hasMany(Asset::class, 'model_id')->Deployed();
    }

    /**
     * How many distinct Orders this asset model has appeared on across
     * all of its Asset instances. Since each Asset is 1:1 with a
     * transaction via AssetObserver::created, this is the count of
     * distinct order_ids on order_items linked to any of this model's
     * assets. Useful for the info-panel "how many times has this model
     * been ordered" hint.
     */
    public function ordersCount(): int
    {
        // Purchases only (positive qty) — see HasOrders::ordersCount for
        // the rationale on filtering out corrections/consumption events.
        return (int) OrderItem::query()
            ->where('item_type', Asset::class)
            ->whereIn('item_id', $this->assets()->select('id'))
            ->where('qty', '>', 0)
            ->distinct()
            ->count('order_id');
    }

    public function archivedAssets()
    {
        return $this->hasMany(Asset::class, 'model_id')->Archived();
    }

    public function percentRemaining()
    {
        // Prefer the pre-loaded withCount attributes — Api\AssetModelsController
        // ::index already eager-loads these as `remaining` (available count)
        // and `assets_count` (total) via correlated subqueries on the parent
        // models SELECT. Reading them here avoids re-running the same counts
        // as N+1 queries per model in the transformer loop. Read straight off
        // getAttributes() rather than via __get so we don't accidentally
        // trigger a relation load when the attribute isn't there.
        // Cast to int at read time: PDO with MySQL default emulated prepares
        // returns COUNT() values as string, and Eloquent doesn't auto-cast
        // withCount aliases (no $casts entry for `remaining` / `assets_count`).
        // A string "0" then slips past a strict === 0 guard AND — because PHP
        // 8's arithmetic operators auto-convert numeric strings — still hits
        // DivisionByZeroError at the ratio below.
        $raw = $this->getAttributes();
        $available = (int) ($raw['remaining'] ?? $this->availableAssets()->count());
        if ($available === 0) {
            return 0;
        }

        // Also guard the divisor. In principle available > 0 implies
        // total > 0 (available is a subset of total via the RTD scope), but
        // a data anomaly — an asset counted by availableAssets but not by
        // assets, or a race between the two correlated withCount subqueries
        // — has been observed in production. Return 0 rather than throw.
        $total = (int) ($raw['assets_count'] ?? $this->assets()->count());
        if ($total === 0) {
            return 0;
        }

        return $available / $total * 100;
    }

    /**
     * Establishes the model -> category relationship
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since  [v1.0]
     *
     * @return Relation
     */
    public function category()
    {
        return $this->belongsTo(Category::class, 'category_id');
    }

    /**
     * Establishes the model -> depreciation relationship
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since  [v1.0]
     *
     * @return Relation
     */
    public function depreciation()
    {
        return $this->belongsTo(Depreciation::class, 'depreciation_id');
    }

    /**
     * Establishes the model -> manufacturer relationship
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since  [v1.0]
     *
     * @return Relation
     */
    public function manufacturer()
    {
        return $this->belongsTo(Manufacturer::class, 'manufacturer_id');
    }

    /**
     * Establishes the model -> fieldset relationship
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since  [v2.0]
     *
     * @return Relation
     */
    public function fieldset()
    {
        return $this->belongsTo(CustomFieldset::class, 'fieldset_id');
    }

    public function customFields()
    {
        return $this->fieldset()->first()->fields();
    }

    /**
     * Establishes the model -> custom field default values relationship
     *
     * @author hannah tinkler
     *
     * @since  [v4.3]
     *
     * @return Relation
     */
    public function defaultValues()
    {
        return $this->belongsToMany(CustomField::class, 'models_custom_fields')->withPivot('default_value');
    }

    /**
     * Gets the full url for the image
     *
     * @todo this should probably be moved
     *
     * @author [A. Gianotto] [<snipe@snipe.net>]
     *
     * @since  [v2.0]
     *
     * @return Relation
     */
    public function getImageUrl($path = null)
    {
        if ($this->image) {
            return Storage::disk('public')->url(app('models_upload_path').$this->image);
        }

        return false;
    }

    /**
     * Checks if the model is deletable
     *
     * @author A. Gianotto <snipe@snipe.net>
     *
     * @since  [v6.3.4]
     *
     * @return bool
     */
    public function isDeletable()
    {
        return Gate::allows('delete', $this)
            && ((int) ($this->assets_count ?? $this->assets()->count()) === 0)
            && ($this->deleted_at == '');
    }

    /**
     * -----------------------------------------------
     * BEGIN QUERY SCOPES
     * -----------------------------------------------
     **/

    /**
     * scopeInCategory
     * Get all models that are in the array of category ids
     *
     *
     * @return mixed
     *
     * @author  Vincent Sposato <vincent.sposato@gmail.com>
     *
     * @version v1.0
     */
    public function scopeInCategory($query, array $categoryIdListing)
    {
        return $query->whereIn('category_id', $categoryIdListing);
    }

    /**
     * scopeRequestable
     * Get all models that are requestable by a user.
     *
     *
     * @return $query
     *
     * @author  Daniel Meltzer <dmeltzer.devel@gmail.com>
     *
     * @version v3.5
     */
    public function scopeRequestableModels($query)
    {
        return $query->where('requestable', '1');
    }

    /**
     * Query builder scope to search on text, including catgeory and manufacturer name
     *
     * @param  Illuminate\Database\Query\Builder  $query  Query builder instance
     * @param  text  $search  Search term
     * @return Illuminate\Database\Query\Builder Modified query builder
     */
    public function scopeSearchByManufacturerOrCat($query, $search)
    {
        return $query->where('models.name', 'LIKE', "%$search%")
            ->orWhere('model_number', 'LIKE', "%$search%")
            ->orWhere(
                function ($query) use ($search) {
                    $query->whereHas(
                        'category', function ($query) use ($search) {
                            $query->where('categories.name', 'LIKE', '%'.$search.'%');
                        }
                    );
                }
            )
            ->orWhere(
                function ($query) use ($search) {
                    $query->whereHas(
                        'manufacturer', function ($query) use ($search) {
                            $query->where('manufacturers.name', 'LIKE', '%'.$search.'%');
                        }
                    );
                }
            );
    }

    /**
     * Query builder scope to order on manufacturer
     *
     * @param  Builder  $query  Query builder instance
     * @param  text  $order  Order
     * @return Builder Modified query builder
     */
    public function scopeOrderManufacturer($query, $order)
    {
        return $query->leftJoin('manufacturers', 'models.manufacturer_id', '=', 'manufacturers.id')->orderBy('manufacturers.name', $order);
    }

    /**
     * Query builder scope to order on category name
     *
     * @param  Builder  $query  Query builder instance
     * @param  text  $order  Order
     * @return Builder Modified query builder
     */
    public function scopeOrderCategory($query, $order)
    {
        return $query->leftJoin('categories', 'models.category_id', '=', 'categories.id')->orderBy('categories.name', $order);
    }

    public function scopeOrderFieldset($query, $order)
    {
        return $query->leftJoin('custom_fieldsets', 'models.fieldset_id', '=', 'custom_fieldsets.id')->orderBy('custom_fieldsets.name', $order);
    }

    /**
     * Query builder scope to order on created_by name
     */
    public function scopeOrderByCreatedByName($query, $order)
    {
        return $query->leftJoin('users as admin_sort', 'models.created_by', '=', 'admin_sort.id')->select('models.*')->orderBy('admin_sort.first_name', $order)->orderBy('admin_sort.last_name', $order);
    }

    /**
     * Query builder scope to sort by the calculated `% remaining` column.
     *
     * `% remaining` is (available / total) * 100 — see percentRemaining().
     * The caller (Api\AssetModelsController::index) already adds the
     * `remaining` and `assets_count` withCount aliases before applying
     * this scope, so we reference them directly in ORDER BY. Guarded
     * against division by zero for models with no assets. Uses
     * orderByRaw because Laravel's query builder has no arithmetic API
     * for ORDER BY expressions.
     *
     * PostgreSQL note: this expression references SELECT-list aliases
     * inside a compound ORDER BY expression, which PostgreSQL rejects
     * per SQL standard. Snipe-IT officially supports MySQL/MariaDB and
     * tests on SQLite (both allow this); moving to PostgreSQL would
     * require inlining the subqueries or wrapping the query in an
     * outer SELECT.
     */
    public function scopeOrderPercentRemaining($query, $order)
    {
        $direction = strtolower($order) === 'asc' ? 'asc' : 'desc';

        return $query->orderByRaw('CASE WHEN assets_count = 0 THEN 0 ELSE (remaining * 100.0 / assets_count) END '.$direction);
    }
}